Lubricator



Aug. 3 1926. 1,594,713

J. ERICKSON LUBRICATOR Filed April 14, 1924 gnw'nl'oz fill/z EricksonPatented Aug. 3, 192? I i i V UNITED STATES PATENT OFFICE.

JOHN ERICKSON, or ivranrson, WISCONSI1\T, ASSIGI\IOR TO MnnIsoN Kirconsona- TION, or MADISON, WISCONSIN, A conronnrron or WISCONSIN.

nunurcnron.

LApplication filed April 14, 1924. Serial no. 706,609.

This invention pertainsto lubricators, and ed in this opening and heldin place by a more particularly to the force feed type packing gland 12through which piston rod wherein a piston is employed to eject a or stem9 passes. charge that passes into a cylinder from a It will thus be seenthat the oil will flow 5 superimposed reservoir. by gravity through theport 7 into the space In Letters Patent N 0. 1,359,584, granted in rearof the piston 8 when the piston is in to me under date of November 23rd,1920, its forward position where it is normally there is shown astructure wherein it was held by a spring 13 encircling the rod 9, andsought, by the provision of a groove extendbearing at one end on therear face of the 10 ing around the inner wall of the cylinder piston andat its opposite end against a and opening into the inlet port throughwasher l4 placed in front of the packing 11. which the lubricant or oilwas fed to the Upon drawing the piston rearwardly, by cylinder, toprevent the passage of oil backpulling upon the handle 10, the oilwithin ward along the face of the piston and to the the cylinder in rearof the piston will be' 15 rear thereof; this with a view of preventingforced upwardly through the port 7 and will any oil from passing alongthe piston rod not be forced outwardly along the rod 9 by and outwardlythereof, where it would come reason of the fact that the packing oil'ersinto contact with the hands of the operator. more resistance to itspassage than does the While such a construction is more or less weightof the oil in the reservoir 5. When 20 advantageous for the purpose inview, I have drawn outwardly, piston 8 uncovers the port found thatultimatelythe oil will work back 6, allowing a charge of oil to passthrough of the piston and consequently out along sa1d port into thecylinder in front ofthe the piston rod and finally onto the operatpiston, the opening 7 still remaining open or ing handle, which ofcourse is objectionable. partially so. Upon release of the handlethe 25The present invention has for its object sprlng will force the pistonforwardly and the provision of means whereby the presence eject the 011past the valve 3 and outwardly of oil upon the piston rod may beobviated. from the projection or extension 2. At such The invention isshown in the annexed time the oil will again gravitate through thedrawing wherein the lubricator is shown in port 7 into the space in rearof the piston.

30 longitudinal sectional elevation. It is found'that this arrangementof the In the drawing, 1 denotes a shell in which re-fiow port 7obviates the difiiculty whichv is mounted a bushing 2, the outer end ofwas sought to be obviated, and was obviated which extends beyond theshell, and is shown to a greater or less extent, by the structure asthreaded for connection to the part to be shown in my former patentabove alluded to.

' lubricated or to a pipe leading thereto. A The spring may of course beomitted and 00 check valve 3 is seated in this extension and the pistonmanually operated in both direcprevents retrograde flow of the oil whenthe tions.

piston of the lubricator is moved rearwardly. WVhat I claim is:

A cylinder, as 4, is formed in the shell, said 1. In a lubricator thecombination of a cylinder being produced by boring out the cylinderhaving a discharge port; a resershell and likewise boring out thebushing, voir surmounting the same; a piston mountthough of course, inso far as the present ined forjreciprocation in the cylinder; a pistonvention is concerned, the cylinder might be rod extending outwardly fromthe piston formed entirely within the shell and no and through the rearportion of the cylin- 45 bushing employed. Overlying the cylinder der;and a packing surrounding the rod adand preferably formed as an integralpart j acent the rear end of the cylinder and servof the shell is areservoir 5, the lower wall ing to prevent the passage of oil outwardlyof which is provided with two ports 6 and along the rod, the reservoirbeing provided 7, which open directly into the cylinder 4. with twolaterally extending ports openlng 50 A piston 8 is mounted forreciprocation in directly into the cylinder adjacent the oppo- 1 the clinder, and a piston rod 9 extends site ends thereof, that port locatedadjacent therefi'om and is provided with a handle 10 the rear end of thecylinder being in free at its outer end. The rear portion of thecommunication therewith and with the resershell 1 is internally threadedin line with the voir at all times.

cylinder, and a suitable packing 11 is insert- 2. In a lubricator thecombination of a shell having acylinder extending longitudinally thereofand communicating :at one end With a discharge port; a reservoirsurmounting the shell with a pair of laterally extending ports openingfrom the bottom of the reservoir directly into the cylinder adjacentopposite ends thereof; a piston mounted for reciprocation in said 0extending outwardly t tough the cylinder;

10 a packing secured in therear end of the linder; a piston rod'cylinder and surrounding the rod; and a spring encircling the and actingto force the piston forwardly in the cylinder, the rear of the laterallyextending ports or that located adjacent the rear end of the cylinderbeing in 'tree communicationtherewith and with the reservoir at alltimes.

"In testimony whereof I have signed my name to this specification.

JOHN ERICKSON.

